drivers/mca/mca-bus.c

   1 /* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3 /*
   4  * MCA bus support functions for sysfs.
   5  *
   6  * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com>
   7  *
   8 **-----------------------------------------------------------------------------
   9 **
  10 **  This program is free software; you can redistribute it and/or modify
  11 **  it under the terms of the GNU General Public License as published by
  12 **  the Free Software Foundation; either version 2 of the License, or
  13 **  (at your option) any later version.
  14 **
  15 **  This program is distributed in the hope that it will be useful,
  16 **  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 **  GNU General Public License for more details.
  19 **
  20 **  You should have received a copy of the GNU General Public License
  21 **  along with this program; if not, write to the Free Software
  22 **  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 **
  24 **-----------------------------------------------------------------------------
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/device.h>
  29 #include <linux/mca.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/slab.h>
  33
  34 /* Very few machines have more than one MCA bus.  However, there are
  35  * those that do (Voyager 35xx/5xxx), so we do it this way for future
  36  * expansion.  None that I know have more than 2 */
  37 static struct mca_bus *mca_root_busses[MAX_MCA_BUSSES];
  38
  39 #define MCA_DEVINFO(i,s) { .pos = i, .name = s }
  40
  41 struct mca_device_info {
  42         short pos_id;           /* the 2 byte pos id for this card */
  43         char name[DEVICE_NAME_SIZE];
  44 };
  45
  46 static int mca_bus_match (struct device *dev, struct device_driver *drv)
  47 {
  48         struct mca_device *mca_dev = to_mca_device (dev);
  49         struct mca_driver *mca_drv = to_mca_driver (drv);
  50         const unsigned short *mca_ids = mca_drv->id_table;
  51         int i = 0;
  52
  53         if (mca_ids) {
  54                 for(i = 0; mca_ids[i]; i++) {
  55                         if (mca_ids[i] == mca_dev->pos_id) {
  56                                 mca_dev->index = i;
  57                                 return 1;
  58                         }
  59                 }
  60         }
  61         /* If the integrated id is present, treat it as though it were an
  62          * additional id in the id_table (it can't be because by definition,
  63          * integrated id's overflow a short */
  64         if (mca_drv->integrated_id && mca_dev->pos_id ==
  65             mca_drv->integrated_id) {
  66                 mca_dev->index = i;
  67                 return 1;
  68         }
  69         return 0;
  70 }
  71
  72 struct bus_type mca_bus_type = {
  73         .name  = "MCA",
  74         .match = mca_bus_match,
  75 };
  76 EXPORT_SYMBOL (mca_bus_type);
  77
  78 static ssize_t mca_show_pos_id(struct device *dev, struct device_attribute *attr, char *buf)
  79 {
  80         /* four digits, \n and trailing \0 */
  81         struct mca_device *mca_dev = to_mca_device(dev);
  82         int len;
  83
  84         if(mca_dev->pos_id < MCA_DUMMY_POS_START)
  85                 len = sprintf(buf, "%04x\n", mca_dev->pos_id);
  86         else
  87                 len = sprintf(buf, "none\n");
  88         return len;
  89 }
  90 static ssize_t mca_show_pos(struct device *dev, struct device_attribute *attr, char *buf)
  91 {
  92         /* enough for 8 two byte hex chars plus space and new line */
  93         int j, len=0;
  94         struct mca_device *mca_dev = to_mca_device(dev);
  95
  96         for(j=0; j<8; j++)
  97                 len += sprintf(buf+len, "%02x ", mca_dev->pos[j]);
  98         /* change last trailing space to new line */
  99         buf[len-1] = '\n';
 100         return len;
 101 }
 102
 103 static DEVICE_ATTR(id, S_IRUGO, mca_show_pos_id, NULL);
 104 static DEVICE_ATTR(pos, S_IRUGO, mca_show_pos, NULL);
 105
 106 int __init mca_register_device(int bus, struct mca_device *mca_dev)
 107 {
 108         struct mca_bus *mca_bus = mca_root_busses[bus];
 109         int rc;
 110
 111         mca_dev->dev.parent = &mca_bus->dev;
 112         mca_dev->dev.bus = &mca_bus_type;
 113         sprintf (mca_dev->dev.bus_id, "%02d:%02X", bus, mca_dev->slot);
 114         mca_dev->dma_mask = mca_bus->default_dma_mask;
 115         mca_dev->dev.dma_mask = &mca_dev->dma_mask;
 116         mca_dev->dev.coherent_dma_mask = mca_dev->dma_mask;
 117
 118         rc = device_register(&mca_dev->dev);
 119         if (rc)
 120                 goto err_out;
 121
 122         rc = device_create_file(&mca_dev->dev, &dev_attr_id);
 123         if (rc) goto err_out_devreg;
 124         rc = device_create_file(&mca_dev->dev, &dev_attr_pos);
 125         if (rc) goto err_out_id;
 126
 127         return 1;
 128
 129 err_out_id:
 130         device_remove_file(&mca_dev->dev, &dev_attr_id);
 131 err_out_devreg:
 132         device_unregister(&mca_dev->dev);
 133 err_out:
 134         return 0;
 135 }
 136
 137 /* */
 138 struct mca_bus * __devinit mca_attach_bus(int bus)
 139 {
 140         struct mca_bus *mca_bus;
 141
 142         if (unlikely(mca_root_busses[bus] != NULL)) {
 143                 /* This should never happen, but just in case */
 144                 printk(KERN_EMERG "MCA tried to add already existing bus %d\n",
 145                        bus);
 146                 dump_stack();
 147                 return NULL;
 148         }
 149
 150         mca_bus = kzalloc(sizeof(struct mca_bus), GFP_KERNEL);
 151         if (!mca_bus)
 152                 return NULL;
 153
 154         sprintf(mca_bus->dev.bus_id,"mca%d",bus);
 155         sprintf(mca_bus->name,"Host %s MCA Bridge", bus ? "Secondary" : "Primary");
 156         if (device_register(&mca_bus->dev)) {
 157                 kfree(mca_bus);
 158                 return NULL;
 159         }
 160
 161         mca_root_busses[bus] = mca_bus;
 162
 163         return mca_bus;
 164 }
 165
 166 int __init mca_system_init (void)
 167 {
 168         return bus_register(&mca_bus_type);
 169 }